Well I wish I could speak from experience, but the best I got is the answer a local game warden gave me when I asked him the same thing. He said in general to call much longer than you would for coyotes. Also to use distress calls from bigger prey, I.E. forget about squeaks and cottontails, start with jackrabbit or fawn/calf distress. Also he said you're better off to spend time glassing and trying to call after you've spotted some rather than just call blind, focusing your glassing on sunny hillsides during cold weather.
Obviously that would be the ideal situation but the trick is to locate them in the first place. Best of luck to you.

Last year my buddies and I called in two wolfs. I shot one of them. We spotted them from about 300 yards down the hill first. We used a jack rabbit call I believe. See this post for the whole write up.1st wolf tag punched

I have yet to connect, but I was down in your neck of the woods last archery. I thought my bud said bull in the road, we where on gated rd. So I cow called, he missed shot, it was 72 yrd,saw him lazer but he lazered bush closer.4 grays in that group. This year up river rd. high, he spooked deer and called one in shot it at 11 yrd. cow call,same as me in archery. We are in same spot elk hunting I got my 338 Norma here one about 400 yrd away in saddle, I book over throw a few cow calls ,nada.I got about 6-7 answer me in wolf cr. area last year with diafram call and tube,just sound howley, took of with rifle that holds 2 and after I heard all those I wish I had my cartridge pack, but none showed up.